Dovetail joint and method of forming the same.



O. G. WYSO DOVETAIL JOINT AND METHOD 0 MING THE SAME.

A IIIIIIIIIIIIIIIII PT. 1 8 1 9 1 2.

1 1 22,350. Patented Dec. 29, 1914.

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0. 0. WYSONG.

DOVETAIL JOINT AND METHOD OF FORMING THE SAME.

APPLICATION FILED SEPT. 18. 1912.

1,1 22,350., Patented Dec. 29, 1914.

2 SHEETS-SHEET 2.

OLMEDO CORTEZ WYSONG, 0F GREENSBORO, NORTH CAROLINA.

DOVETAIL JOINT AND METHOD OF FORMING SAME.

Specification of Letters Patent. 7 Patgnted De 29 1914.

Application filed September 18, 1912. Serial No. 721,000.

In Figs. 1 to 5 and 7 to 9 I have illustrated a dovetail joint with opentongues To all whom it may concern Be it known that I, OLMEDO Coxrnz WY-SONG, a citizen of the United States, residing at Greensboro, in. thecounty of Guilford and State of North Carolina, have invented certainnew and useful Improvements in Dovetail Joints and Methods of FormingSame, of which the following is a specification.

My invention relates to improvements in dovetail joints and method offorming the same.

One of its objects is to provide a dovetail joint for cabinet workboxes, and similar articles in which the tongues and grooves may be cutin a multiplicity of stock members at one operation.

Another object is to provide an improved form of inter-engaging dovetailtongues and grooves and method of forming the same.

Another object is to provide pockets or recesses in the joint to receivethe glue thereby producing stronger joints.

My invention further comprises certain details of form, combination andarrangement, and order of procedure, all of which will be fully setforth in the description of the accompanying drawings in which:

Figure 1 is a perspective view of a stack or series of stock memberswith dovetail tongues and grooves cut in the end thereof. Fig. 2 is aperspective view of a stack or series of stock members illustrating apreliminary'step preferably employed in producing the dovetail tonguesand grooves of Fig. 1. Fig. 3 is a perspective view of one of the stockmembers of Fig. 1, having indicated thereon in dotted line a subsequentstep of clipping the corners of the dovetail tongues. Fig. 4: is a viewsimilar to Fig. 3 illustrating in full line said subsequent step ofclipping the corners of the dovetail tongues. Fig. 5 is an end view ofFig. 1.

Fig. 6 is a plan view of a means or mechanism for clipping the cornersof the dovetail tongues. Fig. 7 is an outside perspective view of adovetail joint formed by employing a stock member of the styleillustrated in Fig. 1 and a stock member of the style illustrated inFigs. 4 and 5. Fig. 8 is an inside perspective View of Fig. 7. Fig. 9 isa sectional view through the same on line w w of Fig.8.

The accompanying drawings represent the preferred embodiments of myinvention.

.or grooved one at a time.

and grooves suitable for general cabinet work, box corners and similaruses. The tongues and grooves for the joint are preferably formed bystacking and clamping a considerable number of stock or work members Aand B together upon a suitable work holder, whereupon they may besubjected directly to the action of a series of conical cutters wherebya series of dovetail grooves 3 are formed in the end of all of saidstock members at one operation. Such practice however in order to outthe dovetail grooves rapidly under all conditions would subject theconical cutters to unnecessary strain and be liable to heat the cuttersso as to afiect or draw their temper and be liable to dull their cuttingedges. I therefore prefer to employ two sets of cutters, one set whichmay consist of a series of circular saws to make rough or preliminarycuts such as illustrated in Fig. 2, and to remove the bulk of thematerial from the grooves, said preliminary cutters to be followed by aseries of conical cutters which make finish cuts 7 and transform thepreliminary grooves 4 of Fig. 2 into the dovetail grooves 3, of Fig. 1,with intervening dovetail tongues 53, and the two sets of cutters formaking the preliminary and finish or dovetail cuts are preferablymounted in one mechanism in line so that one feed movement of the stocksubjects it to the action of both sets of cutters and produces thetongues and grooves upon one end of a series of stock members asillustrated in Fig. 1, whereuponthe stock is reversed and its oppositeend treated in like manner. By employing both preliminary and conicalcutters, the stock may be fed rapidly to the cutters even when cuttinghard wood without heating or injury to the cutters, while by stackingthe stock members and grooving a number of them at one operation theedges of the grooves are not liable to be splintered as the cuttersleave the respective stock members. The stock members may however ifdesired be cut After the stock members A and B have both been cut orgrooved toone pattern as illustrated in Fig. 1, one set of said stockmembers, say members B are separated from members A and are then furthertreated to clip or chip the corners 8 indicated in dotted lines Fig. 3from said dovetail tongues, thereby causing the tongues of stock membersB to assume the outline illustrated in Figs. 4 and 5. The corners 8 oftongues 6 are preferably severed by means of knives 9 set in a frame 10,to which knives the stock members 13 are successively presented endwise,whereupon the grain of the stock being parallel to the out, said corners8 are readily cut or chipped away from the tongues 6. Other means may beemployed if desired to cut away or remove the corners 8. After thecorners 8 have been cut away from the tongues 6, the stock members areready to be assembled as indicated in Figs. 7, 8 and 9 to form clovetailjoints, which is effected by inserting the tongues 6 of members 13endwise into the grooves 3 of members A. When the members A and B are soassembled they present an unbroken face on the outside and also on theinside, but as will be noted from Fig. 9 the faces 12 of the tongues 6do not quite make contact with the adjacent faces 14 of the tongues 5,leaving tapered recesses or spaces 15 between said faces 12 and 14 intowhich the excess of glue commonly employed to unite dovetail joints iscrowded as the stock members A and B are united so as to fill saidspaces. The glue in spaces 15 upon setting and drying serves to greatlyincrease the strength with which the respective tongues are lockedtogether.

The improved dovetail joint as herein illustrated and described iscapable of considerable modification without departing from the spiritor principle of my invention, and the said joint has many points ofpractical superiority and economy.

Having described my invention, what I claim is:

1. A dovetail joint comprising two members each provided with dovetailtongues and intervening dovetail grooves,the corners of the tongues ofone of said members being removed to permit said tongues to beinserted-endwise in a transverse direction into to interlock with thedovetail grooves of the opposite member.

2. A dovetail joint comprising two members each provided with dovetailtongues and intervening dovetail grooves of the same pattern, thecorners of the tongues of one of said members being removed to permitsaid tongues to be inserted endwise into the dovetail grooves of theopposite member in a transverse direction.

Copies of this patent may be obtained for 3. A dovetail joint presentingunbroken exterior and interior faces and comprising two members eachprovided with dovetail tongues and intervening dovetail grooves, thecorners of the tongues of one member being cut away to permit saidtongues to be inserted endwise into and to interlock with the dovetailgrooves of the opposite member.

4. A dovetail joint presenting unbroken exterior and interior faces'andhaving concealed pockets to receive and hold a portion of the glueemployed to lock the joint, said joint comprising two members eachprovided with dovetail tongues and intervening dovetail grooves, thecorners of the tongues of one member being cut away to permit saidtongues to be inserted endwise into and interlock with the dovetailgrooves of the opposite member.

5. A dovetail joint comprising a member having dovetailed notchesdefining intervening dovetailed tongues, and a member having notches andtongues presenting a dovetailed outline at one plane face and arectangular outline at the other plane face of said member, the changefrom one outline to the other being effected by two faces at an obliqueangle to each other and meeting at a line leading diagonally from thebase of each tongue to the outer end thereof.

6. A dovetail joint comprising a member provided with dovetail notchesand intervening dovetail tongues, and a member provided with dovetailnotches and intervening dovetail tongues each having one set of cornersremoved to enable said members to be assembled by inserting the tonguesof one member in a transverse direction into the notches of the othermember to provide a joint with an unbroken surface and concealed gluepockets.

7. The method of forming dovetail oints which comprises cutting dovetailgrooves with intervening dovetail tongues in both members of the oint,removing the corners of the dovetail tongues on one member, andinserting the tongues of said member endwise in a transverse directioninto the dovetail grooves of the opposite member.

In testimony whereof I have affixed my signature in presence of twowitnesses.

OLMEDO 'CORTEZ WYSONG.

WVitnesses:

J. K. MYRICK, G. H. WALKER.

five cents each, by addressing the Commissioner of Patents. Washington,D. C.

